Commissioning Instructions

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Siemens Web server OZW772... V7.0 CE1C5701en
Building Technologies Commissioning 2017-07-03
2.5.3.2 Time of day/date
Path: Home > 0.2.150 OZW772.xx > Settings > Time of day/date
Data point
Explanation, example
Time zone
Default val: GMT +01:00
Berlin, Rome
Setting val: misc. Time zones
The time zone setting value is based on UTC
(GMT). The time zone also defines daylight
saving time / standard time changeover.
—
Time server
Default value:
0.siemens.pool.ntp.org
Setting values:
Max. 49 characters
Settings for the address of the network time
server used to synchronize the OZW web
server time.
Time synchronization is over the network if not
time server is entered and the web server
operated per the setting “Time
synchronization”.
—
Time server available
Indicates whether the time from the network
time server was successfully read at the last
attempt (Yes / No). “No” is displayed when the
time server is turned off.
—
—
The synchronization is performed as follows when time synchronization is enabled
over the network time server:
 At device start up within 10 s.
 After a change in data point time server, time synchronization, clock mode KNX,
or clock slave remote setting, within 10 s.
OZW does not assume the time for data point settings Time synchronization =
"Slave on bus", Clock mode KNX = "Slave" and Clock slave remote setting KNX =
"No".
Synchronization is performed every 8 hour. Three additional attempts are made if
synchronization fails within 60 s. It then waits for another 8 hours.
To reduce field bus load, the Internet time is only used if it deviates by more than
47 seconds from the current time on the OZW.
The data point “Time zone” is not affected.
Time zone,
Time server
Note